Emergency Boiler Repair in Stone, Wilmington & Darenth (DA2)

The Valuation Office sorts every home on the council tax list by when it was built, and in DA2 the 1955 to 1964 band holds 2,830 of 10,340, about 27%, more than any other. A house of that age has been through several boilers by now, and what heats it today depends on the choices of each owner since. Some have a combi on the wall with the pump sealed inside its casing. Others still run a boiler, a hot water cylinder and a pump that is a unit of its own on the pipework, commonly tucked away with the cylinder in the airing cupboard. Both kinds can stick after months of doing nothing. They show it in slightly different ways, and it helps to know which one you have before you ring.

No hot water cylinder in the house usually means a combi.

The 2021 Census found mains gas was the only central heating in 7,797 of DA2’s 9,607 households, about four in five. For them a stuck pump stops the whole heating system, not one room.

The pump after a summer off

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Through the summer the heating side of the system is asked for very little. To stop the pump seizing in that time, many boilers give it a short run after a day standing idle, and the length differs from model to model: ten seconds after a full day on a Worcester HE plus, one minute in every twenty-four hours on a Potterton Promax, about two minutes on a Main HE. Ideal states the catch plainly. Switch the boiler off at the mains and that exercise does not run. So a boiler turned off at its spur in May may have had a pump sitting still until the first cold morning of autumn. The programmer calls for heat, the boiler lights, and the water in its heat exchanger warms with nowhere to go. Viessmann’s guidance is that when the pump fails, hot water cannot travel away from the boiler, and a boiler that is overheating will likely shut itself down. To you that looks like a boiler that fires, runs briefly and stops, sometimes with a fault light, while the radiators stay cold or barely warm. You may hear a hum or feel a vibration, which Viessmann also lists as a possible sign of a pump in trouble. On an older system the pump and the boiler can be in different rooms, even on different floors, so the hum is not always where the boiler is.

A reset only retries the ignition. It cannot turn a pump.

What you can safely do is short. Read the display and the pressure gauge, and note any code. Listen at the boiler, and at the airing cupboard if you have a cylinder. Then turn the heating off at its controls rather than letting the boiler fire and stop over and over. Whatever kind of pump you have, look and listen, and leave it alone.

On a call like this the first job is proving it is the pump, because a boiler that lights and then cuts out has more than one possible cause, and a new pump on a boiler with a different fault fixes nothing. With the boiler made safe, the engineer checks whether the pump turns when it is meant to, and then either gets a stuck pump running again or replaces it. Which is right depends on the pump, and on whether it stuck once after a long rest or has been struggling for longer. Whether a separate pump on older pipework gets any daily exercise at all is not something the boiler manuals above answer, so we check how yours is set up on the visit rather than assume. If it gets none, a pump that sat still this summer will sit still the next one too, and that is worth knowing before May.

Baxi says holiday mode can stop parts seizing over a break.

A pump that seized over one summer is a part, not a reason to scrap the boiler, but if it is one breakdown too many on an ageing boiler, we can also arrange a new one, and our page on boiler installations covers what that involves.